From terminal, diskutil list, determine the disk you want. sudo diskutil umount the disk, or use the disk utility gui to do so (not eject, unmount!). Then for example sudo dd if=~/Downloads/CentOS-7-x86_64-Everything-1503-01.iso of=/dev/disk1 bs=1m

Or even better... Use UNETBOOTIN

 To search your mac using the terminal try this:

cd /
find * -iname 'johndoe*'
 

iname means to be case insensitive.

 Struggling with setting the environment variables as instructed by your installation of for example VRAY, Arnold, Yeti or whichever tool you use. Now, under windows and Linux this is super easy, but in OSX they seem to change it with every release.